Caramel Banana Coffee Cake

To make caramel:
In the bottom of a 9-inch spring form or deep cake pan, spread the butter and brown sugar evenly and sprinkle with the rum.

To make cake:
Cream butter and sugar together. Add 1 egg at a time, beating until smooth. Blend in mashed bananas, vanilla and coffee.

In second bowl, stir flour with baking soda, baking powder and salt. Add to banana mixture, stirring only to moisten.

Turn the batter into the caramel-coated pan and spread it evenly. Cook at 350° F for about 35 to 45 minutes, or until a skewer inserted in the center comes out clean.

Let the cake rest for about 1 minute, then invert it onto a serving platter.